Top Videos: Spoils of Babylon, "Between Two Ferns" Holiday Special

This week, Katy Perry was awkwardly caught lip-syncing when her backup track failed at an awards ceremony in France, while Paul Rudd and Kate McKinnon premiered their new web series Hudson Valley Ballers. Someone adorably re-created the movie Elf using pugs, andZach Galifianakis hosted a holiday edition of "Between Two Ferns." Also, Sarah Silverman,Michael Cera and other comedians launched an ugly sweater charity campaign for Stand Up to Cancer, and the first scene of the Kristen Wiig and Tobey Maguire miniseries The Spoils of Babylon premiered. Check out those clips and more in our weekly roundup of the best onlinevideos:

Best of 2013: The top TV moments of the year

"Wholock": What happens when Sherlock Holmes (Benedict Cumberbatch) meets The Doctor from Doctor Who (Matt Smith)? Watch this video to find out:

Hudson Valley Ballers: Check out "Best Friends," the first episode in the hilarious new web series from Paul Rudd and Saturday Night Live's Kate McKinnon. The series, written by SNLscribes Paula Pell and James Anderson, follows two friends who are "living it up" in Hudson Valley.

Spoils of Babylon clip: IFC has released the first scene of The Spoils of Babylon, its upcoming miniseries starring Will Ferrell, Kristen Wiig, Tobey Maguire, Tim Robbins and more.In this clip, oil tycoon Jonas Morehouse (Robbins) is distracted by his business while his daughter Cynthia (Wiig) and adopted son Devon (Maguire) are falling in love.

Katy Perry caught lip syncing: We're gonna hear her roar ... just not in time to the music. This incredibly awkward video shows the host of a French awards show interrupting Katy Perry midway through a performance, after her pre-recorded backing track blatantly fails to match up with her lip movements. Is Katy Perry this generation's Milli Vanilli?

Jash's ugly sweater contest: Jash, the comedy channel founded by Sarah Silverman, Michael Cera, Reggie Watts, Tim Heidecker and Eric Wareheim, recently launched an ugly sweater contest to raise money for Stand Up to Cancer. Watch the promo video here:

Buddy the Pug: Here's a holiday dose of cuteness in your stocking: A little kid narrates the plot of Elf while pugs act it out. (Check out a similar video set to Home Alone here.)

"Between Two Ferns" holiday special: On a special holiday edition of "Between Two Ferns," Zach Galifianakis' guests include Samuel L. Jackson, Tobey Maguire and Arcade Fire. Hilarity (obviously) ensues.